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Dark Day in the Deep Sea (Magic Tree House #39)

3.97  ·  Rating Details  ·  2,971 Ratings  ·  106 Reviews
Jack and Annie continue their quest for the secrets of happiness–secrets they need if they’re going to save Merlin. But when the magic tree house leads them to a tiny deserted island in the middle of the ocean, they’re not sure who needs help more–Merlin or themselves! The brother and sister team are soon rescued by a ship of explorers and scientists. But the crew isn’t lo ...more
Hardcover, 128 pages
Published March 20th 2009 by Random House for Young Readers (first published 2008)
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A Perfect Time for Pandas by Mary Pope OsborneSummer of the Sea Serpent by Mary Pope OsborneLeprechaun in Late Winter by Mary Pope OsborneEve of the Emperor Penguin by Mary Pope OsborneNight of the New Magicians by Mary Pope Osborne
Magic Tree House
14th out of 56 books — 60 voters
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Books I was Forced to Read in School
42nd out of 103 books — 60 voters

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Community Reviews

(showing 1-30 of 3,000)
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Charissa Sophia de la Rosa
We learn that deep under the sea, there are dangerous sea animals like the octopus and sharks.
Dec 04, 2013 Zack rated it it was amazing
I loved this book! Mary Pope Osborne really catches your imagination. She tells facts and fiction at the same time. You will keep on reading it because it catches your attention like a flytrap. In this book, Jack and Annie go back in time and save a giant octopus. I love the ocean because it is a totally different world, which Jack and Annie get to experience. If you read this book, I bet you will love it, too.
Jean O'Shea
Nov 09, 2008 Jean O'Shea rated it really liked it
Shelves: lis565
Dark Day in the Deep Sea by Mary Pope Osbourne is the 39th installment in the early reader series. In each book, the protagonists Jack and Annie discover, in their local grove of trees, a magic tree house that whisks them off on an adventure. Generally, they have a book as a guide and an important task to complete. This series is aimed at the K-3rd grade set.

I love Magic Tree House series! I can always count on its pattern of chapters: discover the tree house and task, begin adventure with confi
Christopher Salcedo
Jul 06, 2012 Christopher Salcedo rated it really liked it
I like this book because in the book it states, Jack and Annie of Frog Creek, Pennsylvania, know they have to find one of the four secrets of happiness to help save Merlin the magician. But when the magic tree house whisks then off to a misty island in the middle of nowhere, they wonder how they will find anything. As the fog lifts, they see a huge three-masted ship-could it be a pirate ship? When a small rowboat makes its way to shore, the three men inside don't look like pirates at all.(pg.1) ...more
Kariata Toure
Aug 21, 2012 Kariata Toure rated it it was amazing
I like the book Dark Day in the Deep Sea because I learned a lot of facts and it adventures."Water covers three-quarter of our earth.Most of the ocean is an enormous plain a little more than two miles deep.But some oceans trenches are more than six miles deep."#12 Another fact I learn was"The ocean is home to thousands and thousands of sea creatures.Mountains and volcanoes are also hidden deep beneath the surface of the sea."#12 The Dark Day in the Deep Sea is adventures"Morgan sent as to tell ...more
Maya Orama
Mar 15, 2015 Maya Orama rated it it was amazing
This story is about a girl and boy named Jack and Annie . Jack and Annie went into the library then out. Jack hid lots of books in his bag. Then they start to run. They both found teddy and Kathleen. Teddy and Kathleen told Jack and annie to take books from the library so the tree house can have more books in the magic tree house. They boo looked for a books that they wanted to go into. It was a pirate book. They wished that they were in it, then they got teleported on the ship of a pirate crew. ...more
Melissa Namba
Dec 18, 2015 Melissa Namba rated it it was ok
I really like the characters and how they don't change from book to book. This was one of the weaker books, because although they were on board a ship dedicated to science, the presentation would make any science teacher vomit. I mean, a talking octopus? Or one so huge that saves drowning children? Come on.
Jun 11, 2016 Mandy rated it it was amazing
So far this has been our favorite Magic Tree House book!! We read it at least 30 times before having to return it to the library, but I have a feeling we'll be buying our own copy. I love how these books weave educational info into a fun story - and this particular book teaches the importance of compassion.
Jul 03, 2009 Tricia rated it it was ok
As I was reading this, I thought "all right, this one really has dramatic tension, they really do get better as the series progresses." But then MPO took out a 2-by-4 and starting hitting us over the head with it. Oof. We get it! All life is precious! But how are scientists going to understand the sea and the creatures within if they can't study it? Anyway, too much preaching. Enthusiasm balloon seriously deflated.
Joshua Jimenez
Sep 30, 2015 Joshua Jimenez rated it it was amazing
The book Dark Day in The Deep Sea by Mary pope is one of my favorites book that has been written.Jack and Annie continue there journey doing quests for Merlin.I like how they like to explore and always work as a team.Well anyway they have to find a source of love.But when they go on a ship things start to head there way and some things get bad.
Mary Lee
Apr 13, 2008 Mary Lee rated it it was ok  ·  review of another edition
My adult brain fought with the idea of the octopus speaking out loud to the sailors and early oceanographers. And while I agree with the *moral* of the story that one of the secrets to happiness is compassion for all living creatures, it seems like MPO has trivialized the way this could have been/can be/needs to be accomplished.
Alejandra torres
Nov 19, 2014 Alejandra torres rated it really liked it
In my opinion, Dark Day in The Deep sea(Magic Tree house,#39)is a great book because the author Mary Pope Osborne made the book have a look of details because its about sea creatures that been in the past, and scientists figuring out if there still out there.I can prove that this had a lot of DETALIS because it said in the text "This Dunkleosteus was part of a family whose name means 'Terrible fish." And they were really TERRIBLE! These twenty-foot-long predators lived about 400 million years ag ...more
Oct 29, 2015 Leto rated it it was amazing
This review has been hidden because it contains spoilers. To view it, click here.
Marco De La Rosa
Nov 03, 2009 Marco De La Rosa rated it really liked it
Shelves: first-quater
This book is a good book if you want to learn about the real beuaty and magic about wondorous sea monsters. Sea monsters may look ugly and nasty but the truth is they csn help you and they won't hurt you if someone just act respectful. When jack and annie travel to this time where captain and sailors sailed back then, the have noticed a big, humungous octopus who tries to encounter them but the sailors get worried and the capitan orders the sailors to attack that nasty maonster before they all l ...more
Mar 04, 2015 Braden rated it it was amazing
It was a good book. this book is Dark Day in the Deep Sea. The author is Mary Pope Osborne. It is a realistic fiction. It had 105 pages. The main characters are Jack and Annie. They are by the Pacific Ocean. The theme was to find the secret of happiness. The plot was getting rescued and the helping out the octopus. The hints about conclusion was all of their bottles of sea creatures. I liked this book and think you would too.
Damrais Marc
Sep 24, 2014 Damrais Marc rated it liked it
This month I read a book called "Dark Day in the Deep Sea" by Mary Pope Osborne. I liked this book because it's adventurous. This book is about two little kids named Jack and Annie. They own a magical tree house. The magic tree house takes them on journeys.
Dec 10, 2013 Libby rated it really liked it
My kids like this more than I do. I find all the dialogue to be quite perfunctory and repetitive... BUT I was really impressed with how many of the facts in this book were learned and retained by my 5-year-old son. For example, we started reading and Eyewitness Ocean book after this and he recognized the HMS Challenger which was mentioned in both books, as well as the image of the Nautilus, and knew what it was. Very cool! WE were given this book with a few others, so we started here because my ...more
Mar 05, 2014 Nathaniel rated it really liked it
I liked it. They were trying to help the ship, but then they were thrown off deck and an octopus saved them. Then the ship people caught it and were trying to kill it, but then they stopped.
Heather Jo
May 09, 2016 Heather Jo rated it really liked it
Shelves: meggie-list
This review has been hidden because it contains spoilers. To view it, click here.
Rhonda K
Jul 07, 2015 Rhonda K rated it really liked it
Shelves: junior-fiction
The 6 y.o. and I loved this entry in the series. Jack and Annie hang out with naturalists/scientists on this particular adventure and encounter a giant octopus!
Sophie V
Jun 11, 2015 Sophie V rated it it was amazing
I liked this book because I found the octopus very funny. I also liked how I learned facts while reading a fiction story. (Sophie, Age 7)
Andy Lin
Jul 24, 2016 Andy Lin rated it it was amazing
I still get nostalgia from this series when I read them in fourth grade. "Ah," That's my relaxed sound. I love Jack and Annie's adventures through books.
Sep 02, 2014 Seth rated it it was amazing
Shelves: by-myself
Jack and Annie almost sunk! Jack and Annie went on the "HMS Challenger." A giant octopus saved them!
Jun 10, 2010 Acton rated it it was amazing
Shelves: sam
The series is about two kids named Jack and Annie who have a magic tree a few blocks away from their house. In this book, they go to the ocean and meet sailormen. Then they get on her majesty's ship, The Challenger and they go to a professor's lab where they see everything he has gotten from the sea. Then the ship floods and they fall off of it. They get attacked by an octopus. Then they capture the octopus and Jack and Annie realize the octopus was trying to save them, not hurt them. Then they ...more
Mar 22, 2016 Shannon rated it really liked it
Shelves: magic-tree-house
Don't let the cover illustration fool you. The octopus turns out to be a good guy.
Maddison Vv
Oct 02, 2014 Maddison Vv rated it it was amazing
i think it was very good and very like you could guess what was coming next in the book
Jan 13, 2016 Qwinton rated it really liked it
it is very interesting and cool and talks about ocean life
Feb 26, 2014 Caleb rated it liked it
I Liked dark day in the deep sea
Anjanette Wold
Read with my 2nd graders
Fit Fun
Jun 14, 2015 Fit Fun rated it it was amazing
Good but sad.
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Mary Pope Osborne has channeled a lifelong love of exploration and travel into one of the most popular children’s book series of the past two decades. With her fantastic Magic Tree House series, Mary Pope Osborne keeps the good times rolling for kids all over the world.
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Other Books in the Series

Magic Tree House (1 - 10 of 55 books)
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  • The Knight at Dawn (Magic Tree House, #2)
  • Mummies in the Morning (Magic Tree House, #3)
  • Pirates Past Noon (Magic Tree House, #4)
  • Night of the Ninjas (Magic Tree House, #5)
  • Afternoon on the Amazon (Magic Tree House, #6)
  • Sunset of the Sabertooth (Magic Tree House, #7)
  • Midnight On The Moon (Magic Tree House, #8)
  • Dolphins at Daybreak (Magic Tree House, #9)
  • Ghost Town at Sundown (Magic Tree House, #10)

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“I do love it. But I want you two to have it. Today, you taught me- no, you taught all of us- an important lesson. It is a dark day in the deep sea when we cause innocent creatures to suffer. The professor said we can conquer our fears through knowledge. But you taught us that our fears can best be conquered through compassion. Even we scientists must never forget to have compassion for all living creatures. My compassion for the little creature that once lived in this shell made me very happy.” 9 likes
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